An advanced mod is available for the Freespace game at moddb.com. Freespace: Evolution claims A new perspective to bring the frantic non-stop action of the original games to the tactical realm of a real-time-strategy game.
Step out of your fighter cockpit and prepare to experience the world of Freespace from a completely different perspective. All the classic and sometimes iconic ships such as the Orion or Lucifer will return once again to a computer screen near you. Take command and lead your fleets into battle, commander, for there can only be victory... or total extinction.
Some features of this version:
[list] [*]11 small to medium sized capital ships from the Freespace universe [*]21 fighters and 13 bombers [*]4 rather simple missions to get in touch with the mod [*]authentic Freespace music, sounds and graphics effects
It's also perfectly compatible to the Nexus Skirmisher, so you can create your own skirmish battles for it (but don't forget to set "freespace" as mission type!). Source: http://www.moddb.com/mods/freespace-evolution